Collapsible mold core



July 2o, 192e. l 1,592,976

C. HUTCHINS COLLAPSIBLE MOLD CORE Filed Nov. 1, 1924 2 Sheets-Sheet l ail u ITV - Hummm Gnome,

July 20 1926. 1,592,976

C. HUTCHINS GOLLAPSIBLE MOLD GORE Filed Nov. 1. 1924 2 Sheets-Sheet 2 Patented July 2O,y 1926.y

UNITED srArss PATENT cerros. g

COLIN HTCHINS, or LEAMNGTON, entriamo, CANADA.

Application filed November In my Patents Nos. 1,363,651 and 1,131,- 000, dated Dec. 28, 1,920, and Oct. 3, 1922, respectively, there are disclosed collapsible mold c'ores that may be advantageously used in a mold for producing hollow building blocks made of concrete or other plastic material, and this is an improvement in conneet-ion with such collapsible cores.

My invention aims to provide a collapsible mold core somewhat along the lines of the cores 'described in my prior patents, but with the present core of such configuration that it may be use'd in the formation of a hollow wall. The core has mold plat-es or frames adapted to be collapsed towards each other and at all times maintained in a parallel relation. Adapted to be used with the lcores are centering membersand spacing devices, the latter forming covers for the'cores to preventconcrete or other plastic material entering thecores during the formation of a hollow wall.

My invention will be hereinafter specilically vdescribed and :then claimed, and reference will now be had to the drawings, wherein Figure 1 is a perspective view of a collapsible mold core with one of the plates thereof broken away.; p

Fig. 2 is an fendv view of the mold core in a collapsed position;

Fig. 3 is a horizontal sectional view of the mold 'core in distended position; n

Fig. 4 is a vertical longitudinal sectional IV-IV of Fia 3;

Fig. 5 Vis a vertical sectional lview of superposed cores in molds adapted for producing a hollow wall, there 'being centering and spacing members associated with the uppermost core;

Fig. 6 is a perspective view of a com bined spacing member and cover for a core;

Fig. 7 is an end view of the .spacing member and cover on the core in the mold, and

Fig. 8 is a perspective view of a plurality of mold cores with some of the cores partly broken away. e v

Each collapsible mold core comprises a set of rectangular frames 1 and 2 preferably made of angle bars and riveted or otherwise connected to .some of the flanges of the angle bar frames are mold plates 3. The frames 1 and 2 are in opposed relation and said frames have the end flanges 4 thereof conview of the mold core taken on vthe yline l ooLLAPsIBLE MOLD conn.

1, i924." serial No. 747,208.

nected by toggle levers 5 and links 6, the links beine` pivotally connected to the toggle levers 5, as at 7, so that the toggle connections can beshifted upwardly to cause the frames to move towards each other, as best shown in Fig. 2.

To facilitate adjustment of` the toggle levers 5 the ends of said levers, at each end of the core, are connected by bars S having handles 9 yat the upper ends thereof and in addition to these bars is an intermediate handle bar 10 pivotally connected by links 11 to a mid rail 12 lof the frame l; there being a mid rail 13 for the frame 2 and for en gagei1ie1it`-`with the handle bar 10, so that the links 11'1nay he placed transversely of the collapsible core to press the center portions of the mold 3 during the formation of a wall.

The top rail 14 of the frame 1 has pivoted latch-es 15 which may be .swung over the handles 9 and under the top rail 14 of the frame 2 to hold the bars 8 in va lowered position, thus preventing accidental collapse y of the mold core when the core is lifted, and

more especially when elevated by gripping the handles 9 at the ends of the core.

As shown in Fig. 5, collapsible cores may be placed in interposed relation and in spaced relation to outer panel mold members `16 to permit of concrete 17 or other plastic material being poured between the mold plates 3 and the mold rmembers 16 to form a hollow wall or other structure.

ln order than an upper core may he correctly positioned on a lower corev centering members 18 are employed, said members having lower broad ends 19 fitting between the adjoining rails of the superposed cores, as best shown in Fig. 5. The upper ends of the centering members are angular to extend on to one or the other of the top rails of the upper core and with these centering` members in position the vertically disposed cores will be properly alined with the mold plates 3 flush for the formation of the inner faces of a hollow wall.

In order that concrete or other plastic material may be poured between the mold members and about the cores, without entering the cores, l provide a combined spacing member and cover which is best shown in Figs. 6 and 7. rlhe cover is designated 2O and is in the form of an inverted channel that may be fitted down over the upper end of the core. Attached to the side flanges of the cover are U-shaped spacing members 2ly and. the members at each side of the 'cover are connected by handle rods 22. vThe space fing members are preferably made of a resilient material and can be sprung into position between the mold plates 3 and the p mold members 16, thereby centering the with vertical channel covers 23, yas vbest shown in Fig. 8, the covers preventing con*- crete yfrom entering the endmost cores.

If the collapsible cores are ott considerable depth and one placed upon the other suitable tools may be used for reaching through the uppermost core t raise the handles in the lowermost core, or the upper core may f be removed and then tools employed igor e1;- tracting the lower core.

Bvreiercnce to Figs. l. 3, l and S 1t will be noted that the mold plates 3 project beyond the frames and are slightly koffset at one end of each core. In consequence ot this the mold plates 3. of one core may overlap the mold plates of an adjacent core.A

The offset' edge of each mold plate is designated 24 and may be best observed Fig.

8. With the `mold plates 3 `shittable in- `vvardly towards each other and in a common plane, it is obvious that a collapsed core may be readily removed. from a Wall. furthermore, that by yusing the end coversQ?) cores may be placed at an angle as WouldA be necessaryT in the formation of an angular Wall. l

l,Onefembodiment of my invention has been illustrated but it is to be understood that the structural elements are susceptible vto 'such variations and modilications as fall Within. the scope oit' the appendedclaims.

What l claim is l. A collapsible mold core comprising frames, plates attached to said trames. toggle links and levers connecting said iframes so that said trames may be moved touv'ard each other,y hand bars to facilitate actuating said links and levers, and latch mechanism for said hand bars to secure said core against accidental collapse, said mechanism being movable into and out oi' locking position ywhen said mold is normally eX- panded by said links. v

2. A collapsible mold core as called fol', in claim l, wherein the last mentioned means includes latches carriedv by onerame `and svvingable over said handle bars and under a portion of the other frame.

3. Collapsible cores adapted to be placed one on the other in a mold, centering members suspended in the upper core and adapted to center the upper core relative to the lower core,- and a cover for the upper core extending over the upper ends ot said spacing means.'

el. Collapsible cores as called Yfor in claim 3, and spacing members carried by said cover and .adapted to engage the mold to center the cores relative to said moldysaid members forming means for the removal ot saidcover. 5. lCollapsible cores adapted to be placed one on the other in a mold, centering members suspended onV the upper core and adapted to center the upper core relative to the lower core, and channel covers for the ends of said cores. s p

6. -The combination of superposed mold members, superposed cores in said superposed molds and adapted to cooperate there- -With in the formation of a hollow Wall. a` icenteriug member atthc juncture of said cores, and resilient spacing means for said cores yieldably engaging said molds. 7. The combination called for infclaim 6 wherein* a cover on the upper core supports said resilient spacing means.

In testimony whereof I affix my signature.

conm i-iU'roniNs. 

